<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
//			let s = [1,2,3,54,78,66,4];
//			for (let k of s) {
//				document.write(k);
//			}

          var s = [1,2,3,54,78,66,4];
          for(var i in s)
          {
          	document.write(s[i]);
          }
		</script>
	</head>
	<body>
	</body>
</html>
